/* Copyright (c) 2015 - 2017, Nordic Semiconductor ASA
 *
 * All rights reserved.
 *
 * Use in source and binary forms, redistribution in binary form only, with
 * or without modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
 *    conditions and the following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 2. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 3. This software, with or without modification, must only be used with a Nordic
 *    Semiconductor ASA integrated circuit.
 *
 * 4. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
 *
 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

'use strict';

function horizontal(sourceRect, targetRect, strokeWidth) {
    const sourceRectMid =
        sourceRect.top - targetRect.top + sourceRect.height / 2;
    const targetRectMid = targetRect.height / 2;

    function calculateBoundingBox() {
        const top =
            -((strokeWidth + 1) / 2) +
            (sourceRectMid < targetRectMid ? sourceRectMid : targetRectMid);
        const height =
            strokeWidth + 1 + Math.abs(sourceRectMid - targetRectMid);
        const width = targetRect.left - (sourceRect.left + sourceRect.width);

        return {
            top,
            left: -width,
            width,
            height,
        };
    }

    const connectorBox = calculateBoundingBox();
    const sourceYCoordinate =
        sourceRectMid < targetRectMid ? 2 : connectorBox.height - 2;
    const targetYCoordinate =
        sourceRectMid < targetRectMid ? connectorBox.height - 2 : 2;

    const lineCoordinates = [
        { x: 0, y: sourceYCoordinate },
        { x: connectorBox.width / 2, y: sourceYCoordinate },
        { x: connectorBox.width / 2, y: targetYCoordinate },
        { x: connectorBox.width, y: targetYCoordinate },
    ];

    return {
        boundingBox: connectorBox,
        lineCoordinates,
    };
}

function vertical(sourceRect, targetRect, strokeWidth) {
    const sourceRectYEntry = sourceRect.top - targetRect.top + 20;
    // const targetRectXEntry = targetRect.width / 2;

    function calculateBoundingBox() {
        return {
            top: -((strokeWidth + 1) / 2) + sourceRectYEntry,
            left: -(targetRect.left - (sourceRect.left + sourceRect.width)),
            width:
                (strokeWidth + 1) / 2 +
                (targetRect.left + targetRect.width / 2) -
                (sourceRect.left + sourceRect.width),
            height: (strokeWidth + 1) / 2 + Math.abs(sourceRectYEntry),
        };
    }

    const boundingBox = calculateBoundingBox();
    const lineCoordinates = [
        { x: 0, y: 2 },
        { x: boundingBox.width - 2, y: 2 },
        { x: boundingBox.width - 2, y: boundingBox.height },
    ];

    return {
        boundingBox,
        lineCoordinates,
    };
}

// eslint-disable-next-line func-names
export default function (strategy) {
    if (strategy === 'vertical') {
        return vertical;
    }
    if (strategy === 'horizontal') {
        return horizontal;
    }
    // Do something funny.
    return undefined;
}
